OpenSUSE 13: Install Flatpak

This article will describe porting Flatpak from Fedora 25 to OpenSUSE 13. But Flatpak needs kernel 4.0 or later while OpenSUSE has kernel 3.16, use kernel 4.4 in OpenSUSE Leap 42.2. You can also
port Flatpak from Fedora 25 to OpenSUSE Leap 42.2.